/**
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.wiser.library.view.smart;

import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.Interpolator;

/**
 * @author Wiser
 * @version 版本
 */
public abstract class SmartTabIndicationInterpolator {

	public static final SmartTabIndicationInterpolator SMART		= new SmartIndicationInterpolator();

	public static final SmartTabIndicationInterpolator LINEAR		= new LinearIndicationInterpolator();

	static final int									ID_SMART	= 0;

	static final int									ID_LINEAR	= 1;

	public static SmartTabIndicationInterpolator of(int id) {
		switch (id) {
			case ID_SMART:
				return SMART;
			case ID_LINEAR:
				return LINEAR;
			default:
				throw new IllegalArgumentException("Unknown id: " + id);
		}
	}

	public abstract float getLeftEdge(float offset);

	public abstract float getRightEdge(float offset);

	public float getThickness(float offset) {
		return 1f; // Always the same thickness by default
	}

	public static class SmartIndicationInterpolator extends SmartTabIndicationInterpolator {

		private static final float	DEFAULT_INDICATOR_INTERPOLATION_FACTOR	= 3.0f;

		private final Interpolator leftEdgeInterpolator;

		private final Interpolator rightEdgeInterpolator;

		public SmartIndicationInterpolator() {
			this(DEFAULT_INDICATOR_INTERPOLATION_FACTOR);
		}

		public SmartIndicationInterpolator(float factor) {
			leftEdgeInterpolator = new AccelerateInterpolator(factor);
			rightEdgeInterpolator = new DecelerateInterpolator(factor);
		}

		@Override
        public float getLeftEdge(float offset) {
			return leftEdgeInterpolator.getInterpolation(offset);
		}

		@Override
        public float getRightEdge(float offset) {
			return rightEdgeInterpolator.getInterpolation(offset);
		}

		@Override
        public float getThickness(float offset) {
			return 1f / (1.0f - getLeftEdge(offset) + getRightEdge(offset));
		}

	}

	public static class LinearIndicationInterpolator extends SmartTabIndicationInterpolator {

		@Override
        public float getLeftEdge(float offset) {
			return offset;
		}

		@Override
        public float getRightEdge(float offset) {
			return offset;
		}

	}
}
